So, so Hertz wird in USA nicht verwendet ?
Dort wird in kc (Kilocycles) und Mc (Megacycles) gerechnet, fehlerhaft, denn kc/s und Mc/s (...cycles per second) wären richtig.
Das ich nicht lache. Das wurde zu meiner Zeit wie ich noch als Übersetzer am US Army Air Defense Center tätig war. Und das ist immerhin fast 50 Jahre her eingeführt. 1966 war ich beim Aufbau der RakSLw USA dabei, da waren es noch Megacycles und bald darauf "Megahörtz" und "Killohörtz"
Da kann man mal sehen, wie lange so etwas in den Köpfen bleibt.
Gruß Lothar
kuck mal da:
TABLE 1
Frequency Bands and Radar Operational«Propagation Limitations
LF
30–300 kHz
Allocations are provided in the frequency range but no radar usage or applications have been
identified.
MF
300–3000 kHz
Used by continuous wave (CW) radar systems for accurate position location. Very high noise
levels are characteristic of this band.
HF
3–30 MHz
Refractive properties of the ionosphere make frequencies in this band attractive for long-range
radar observations of areas such as over oceans at ranges of approximately 500–2000 nautical
miles. Only a few radar applications occur in this frequency range because its limitations frequently
outweigh its advantages: very large system antennas are needed, available bandwidths are narrow,
the spectrum is extremely congested with other users, and the external noise (both natural noise
and noise due to other transmitters) is high.
VHF
30–300 MHz
For reasons similar to those cited above, this frequency band is not too popular for radar. However,
long-range surveillance radars for either aircraft or satellite detection can be built in the VHF band
more economically than at higher frequencies. Radar operations at such frequencies are not
affected by rain clutter, but auroras and meteors produce large echoes that can interfere with
target detection. There have not been many applications of radar in this frequency range because
its limitations frequently outweigh its advantages.
UHF
300–3000 MHz
Larger antennas are required at the lower end than at the upper end of the UHF band. As compared
to the above bands, obtaining larger bandwidths is less difficult, and external natural noise and
weather effects are much less of a problem. At the lower end, long-range surveillance of aircraft,
spacecraft, and ballistic missiles is particularly useful. The middle range of this band is used
by airborne and spaceborne SAR’s. The higher UHF end is well suited for short to medium-range
surveillance radars.
SHF
3 GHz–30 GHz
Smaller antennas are generally used in this band than in the above bands. Because of the effects
of atmospheric absorption, the lower SHF band is better for medium-range surveillance than the
upper portions. This frequency band is better suited than the lower bands for recognition of individual
targets and their attributes. In this band, Earth observation efforts employ radars such as SAR’s,
altimeters, scatterometers, and precipitation radars .
EHF
30–300 GHz
It is difficult to generate high power in this band. Rain clutter and atmospheric attenuation are
the main factors in not using this frequency band. However, Earth observation efforts are made
in this band employing radars such as altimeters, scatterometers, and cloud profile radars